Detailed update on reactors in Japan
Here.
If you're still referring to previously-linked dosage charts, note that they're using milli-sieverts (mSv) in this article, which is 1000 micro-sieverts. 100 mSv is not a low dose, the equivalent of something like 5,000 chest X-rays. Some firefighters at the Chernobyl site were hit with 700 to 13,000 mSv.
True radiation sickness begins to occur when you reach levels of 1000 mSv. Above that it starts to get lethal.
Until this incident, I'd never even heard of Sieverts as a unit.